Hello, I want to create my own elbow on solidwork piping routing.

I follow this tutorial to do this

https://www.youtube.com/watch?feature=player_embedded&v=GL0cL7MxCqA

But I have a problem, with the elbow!

As you can see in the sceen I don’t have the bending radius, “0” so when I do my assembly, the elbow doesn’t work.

I do 3 time this part but it doesn’t want to work if someone knows where the problem comes from. I need help.

Thank you in advance for your answer.